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    <title>Document</title>
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    <div class="nav">
        <div class="nav-item">新闻</div>
        <div class="nav-item">hao123</div>
        <div class="nav-item">地图</div>
        <div class="nav-item">视频</div>
        <div class="nav-item">贴吧</div>
        <div class="nav-item">学术</div>
        <div class="nav-item">更多</div>
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